Pruning-saw.



F. P. BREWER.

PRUNING SAW.

APPLICATION FILED I'EB.14, 19 12.

Patented July 16, 1912.

FRANK P. BREWER, OF ANGOLA, INDIANA.

PRUN IN G-SAW.

Specification of Letters Patent.

Patented July 16 1912.

Application filed February 14, 1912. Serial No. 677,451.

To all whom it may concern;

Be it known that I, FRANK P. BREWER, a citizen of the United States,residing at Angola, in the county of Steuben and State of Indiana, haveinvented certain new and useful Improvements in Pruning-Saws, of whichthe following is a specification.

My invention relates to saws used as implements to prune trees, theoperator standing on the ground and the saw being mount-- ed on a longhandle to enable him to reach the limbs or branches of the tree that arerequired to be cut off.

In a patent granted to me on February 21, 1893, No. $91,980, is shownand described a pruning saw on which my present invention is animprovement. The saw shown in the patent referred to proved to beunsatisfactory for the reason that the saw blade was secured to thewooden pole or handle which would become bent by the strain put upon theblade in stretching it to secure the proper tension for efiective work,and furthermore, the cutting edge being in a straight line the sawswould not cut through the entire upward stroke of the blade, but wouldbind making it necessary at times to withdraw the blade from the kerfand start it over again on a down stroke. I have overcome theseobjections by my present construction hereinafter described and claimed,and have illustrated my improved pruning saw in the drawings heretoannexed in which Figure 1 is a side view of my improved pruning sawshowing it mounted on the upper end of a pole or handle, Fig. 2, anenlarged detail view of the saw frame showing the saw blade undertension, Fig. 3, a viewof the blade removed from the frame, and Fig. l,a detail view of the arm that applies tension to the blade.

In the drawings similar reference characters will be used to designatecorresponding parts in the several views.

A. indicates a pole or handle, such as is commonly used on pruningimplements, and 1 a fiat steel bar, secured in its upper end, and havingits free end tapered as shown at 2.

3 indicates an arm pivotally secured to bar 1 adjacent to the end pole Aand having its free end slotted as shown at 4.

5 indicates a ring secured near the upper end of pole A and having anear 6 extending therefrom on which is fulcrumed alever 7, and 8indicates a link connecting, lever 7 and arm 3.

The saw blade 9 has a hole 10 at each' end adjacent to its cutting edge.

11 indicates a loop or socket pivotally secured to one end of'the blade9, said loop or socket being shaped to fit the tapered end of steel bar1 when the saw is placed in position, the other end of the blade beingmounted in the slotted end 4 of pivoted arm 3 and secured therein bymeans of a bolt 0r rivet 12 engaging holes in said arm and the hole 10in the end of the blade.

By locating the holes 10 adjacent to the cutting edge of the saw it willbe apparent that when tension is applied to the blade by means of lever7 the portion of the blade adjacent to the cutting edge is stretched,while the portion adjacent to the back edge of the blade is compressedfrom the two ends toward the middle of the blade, the effect being toraise the cutting edge slightly upwardly from the two ends to its middlegiving the blade an outwardly curved or convex contour longitudinally.This convexity of the blade is of great advantage and relieves theimplement of one of the objections to the patent hereinbefore referredto, that of binding in the kerf in making an upward stroke, as thebinding takes place after the middle of the blade is reached when thestrain is more and more on the lower end of the blade, the curvedfeature making the cut from the middle of the blade to the finish of thestroke down. hill relative to the direction of the motion of the blade.Furthermore, by mounting the blade on a flat steel bar in stead of thewooden pole, a greater tension can be applied to the blade and when thetension is relieved the bar will return to its normal position, also thebar being comparatively thin makes it possible to cut ofl a limb closeto the trunk where the wound will more quickly and effectively heal, andnot become an unsightly blemish on the tree.

Having thus described my invention what I claim is 1. In a pruning saw,a fixed metallic supporting bar, a saw blade detachably connectedtherewith, said saw blade being provided at its ends with holes disposedin proximity to the cutting edge and" spaced from the rear edge of theblade, and means engaging said holes to apply tension to the blade tocause the same to bend outwardly from its ends to its middle.

2. In a pruning saw, a pole, a steel bar secured in the end of said poleand having its outer end tapered, an arm pivotally mounted on the bar. alever pivotally 1nount-' ed on the pole, a link connecting the arm andlever, and a saw blade removably secured to the tapered end of the steelbar and to the arm.

3. A pruning saw comprising a pole, a steel bar secured in the end ofthe pole and having a tapered outer end, an arm pivotally secured tosaid bar and having a slotted outer end, a lever tulcrumed on the pole,a

link connecting the lever and arm, a saw blade having holes in its endsadjacent to the cutting edge of the blade a socket 1ne1nber pivotallysecured in the hole at one end of the blade and adapted to fit thetapered end of the bar, the other end of the blade being adapted toengage the slot in the outer end of: the arm, and means to secure theblade in the slot in the arm.

In testimony whereof I hereto allix my signature in the presence of twowitnesses.

FRANK P. BREWER.

Vitnesses HARRY E. WILDER, TIARLIE BARNES.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

